THERMAL EFFECTS OF FLUIDS IN MOTION. 
365 
The stopcock for reducing pressure being now partially opened, the observations 
were continued as follows : — 
Time of 
observe- 
Gauge. 
Total pres- 
sure in lbs. 
Temperature of bath by 
Thermometer No. 1, in 
tion. 
per square 
inch. 
degrees Centigrade. 
h m 
50 
55-r 
361-7') 
52 
55-1 
1 
361-9 
54 
55-1 
361-9 
55 
55-1 
361-9 
57 
59 
55-1 
55-1 
>55-12 
22-876 
362-li 
362-3 f 
1 1 
55-1 
362-4 
3 
55-1 
362-7 
5 
55-1 
362-7 
7 
55-3^ 
363 
11 
54-3^ 
363-3^ 
13 
54-4 
363-3 
15 
54-4 
363-5 
17 
54-7 
363-7 
19 
54-5 
>54-51 
23-217 
363-9 > 
20 
54-5 
364-1 
22 
54-6 
364-2 
24 
54-6 
364-2 
26 
54-6 
364-2 
30 
54-6 
375 
32 
54-6 
375-4 
33 
54-2') 
375-4') 
35 
54-3 
375-5 
37 
39 
54-4 
54-6 
>54-38 
23-277 ' 
375-8 1 
375-7 f 
40 
54-3 
375-8 
42 
54-5 J 
: 
376 J 
J=14-760 
>375-7 =13-270 
Temperature of the issuing 
air by Thermometer No. 2 ,. 
in degrees Centigrade. 
>362-26 = 14-693 
>346-19 = 14-579 
344 
344- 8 
345- 3 
345- 8 
346- 0 
346-4 
346- 9 
347- 2 
347-6 
347- 9 
348- 9' 
348- 9 
349- 2 
! 349-4 
350 
350 
350- 3 
350-4 
350-6 
356-4" 
358- 2 
359- 41 
359- 8 j 
30J.I >360 =15-238 
360- 3 
360-4 
Cooling 
effect. 
>349-74=14-749 
0-114 
0-011 
0-032 
Duiingthe above ex[)erinient 100 cubic inches of the air was slowly passed through 
two Liebig tubes containing sulphuric acid, specific gravity 1-8. The first tube 
gained 0-006 of a grain, the second remained at exactly the same weight. 
P.S. Oct. 14, 1853.— The apparently anomalous results contained in the last Table 
have been fully explained, and shown to depend on the alteration of pressure which 
took place towards the beginning of the interval of time from 42“ to 50“, by sub- 
sequent researches which we hope soon to lay before the Royal Society. 
